diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index ee9017558..7202e2052 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -3616,9 +3616,14 @@ class PartialEvaluator {
       }
 
       const widths = dict.get("Widths") || baseDict.get("Widths");
-      if (widths) {
-        uint8array = new Uint8Array(new Uint32Array(widths).buffer);
-        hash.update(uint8array);
+      if (Array.isArray(widths)) {
+        const widthsBuf = [];
+        for (const entry of widths) {
+          if (isNum(entry) || isRef(entry)) {
+            widthsBuf.push(entry.toString());
+          }
+        }
+        hash.update(widthsBuf.join());
       }
 
       if (composite) {